Telephone apparatus.



No. 686,608. Patented Nov. l2, IQOI.

E. W. HAZAZEH'.

TELEPHONE APPARATUS.

(Application filed Jan. 30, 1900.)

3 SheetsSheet I.

(No Model.)

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Patented Nov. I2, l90l. E. W. HAZAZER.

TELEPHONE APPARATUS.

(Application filed Jan. so, 1900.)

3 Sheets'Sheef 2.

(No Model.)

IQN E N0. 686,608. Patented Nov. 12, I90]. v E. w. HAZAZER.

TELEPHONE APPARATUS.

4 (Application filed Jan. 30, 1900.) (No Model.) 3 Sheets-Sheet 3.

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' UNITED STATES PATENT GFFICE,

EDGAR W. HAZAZER, on NEW YORK, N. Y.

TELEPHONE APPARATUS.

\ SPECIFICATION forming part of Letters Patent No. 686,608, dated November 12, 1901.

Application filed January 30, 1900. Serial No. 3,262. (No model.)

.To all whom it may concern:

Be it known that I, EDGAR WV. HAZAZER, a citizen of the United States, residing at New York, county of New York, and State of New York, have invented certain new and useful Improvements in Telephone Apparatus, fully described and represented in the following specification andthe accompanying drawings, forming a part of the same.

This invention relates to certain improvements in telephones, and is more especially adapted for use with that class of telephones known as intercommunicating telephones, which are ordinarily used for interior work, such as the connection of difierent parts of offices or the different rooms .of buildings.

In intercommunicating telephones as now ordinarily constructed when a person at one station wishes to call another station on the line it is necessary first to establish a connection either by inserting a plug or by some of the ordinary forms of switches between the calling-station and the station which is to be called. After a circuit has been established between the stations the person at the call- .ing-station by another and distinct operation calls. the station with which it is desired to communicate. Furthermore, in this class of telephones after communication has been had wire.

between stations it sometimes happens that the person at the calling-station will hang up the receiver, but will forget to remove the plug or operate the switch by which the communication between the stations was established. This calling-station remains, therefore, connected to the common return or main If now a call is made from some station other than the one which has been thus accidentally left in circuit, it happens that when communication is established between the stations, since the first calling-station is also connected to the circuit-wire, the callingcircuit is established between three instruments instead of two, and the talking-circuit is consequently interfered with and weakened, since the circuit which is intended to operate only two instruments is compelled to operate three. Should there be many stations on a line, it will frequently happen by a failure on the part of several stations to break the calling communication that a large number of instruments will be connected on scriber on the line by taking his receiver ofi the hook and turning his switch can cut into the line without the fact being noticed. If, therefore,two stations on the line are talking, it is possiblefor a third party to overhear the conversation by removing the receiver from the hook and turning his switch onto one or the other of the talking-stations, and he is able to do this without giving any warning to either of the talking-stations that the line has been cut into.

It is one of the objects of this invention to produce a switch primarily intended for use in telephone systems, although useful in otherrelations, which is of such a character that it is possible for a person at a calling-station by the act of operating the switch to both call a station with which communication is desired and at the same time to establish a talking-circuit between the stations, thereby doing away with the two operations now usually necessary, and to do this by a simple, effective, and cheap construction which is reliable in operation and which needs no further attention from the calling-station than that which is given by the simple act of operating the switch.

Another object of the invention is to produce an improved switch primarily intended for use in telephone systems of such a character that the act-of hanging up the receiver .after communication has been had between stations will automatically break the talkingcircuit and reset the several instruments in ICO ter that any number of stations on a line may be simultaneously called and communicated with from any station on the line.

A further object of the invention is to produce a simple, cheap, and effective form of switch mechanism.

With these and other objects in view the invention consists in certain constructions and in certain parts, improvements, and combinations, as will be hereinafter fully described and then specifically pointed out in the claims hereunto appended.

In the accompanying drawings, which form a part of this specification, and in which like characters of reference indicate the same parts, Figure 1 is a front view of a telephone box or case, showing the arrangement of pushbuttons by which the circuit-closing devices are operated. Fig. 2 is a view similar to Fig. 1 with the door-case removed. Figs. 3, 4, and 5 are sections on the line 3 3, 4 4, and 5 5, respectively, of Fig. 2. Fig. 6 is a view similar to Fig. 5, showing one of the contact-fingers of the switch in its innermost position and closing the calling-circuit. Fig. 7 is a View showing one of the contact-fingers interlocked with the switch-cylinder, and Fig. 8 is a diagram of the circuits employed.

Referring to the drawings, which represent one embodiment of the invention, 1 indicates the box or case for containing the operating parts of the apparatus, the same being closed by a door 2. The box or case may be constructed in substantially the ordinary form used in intercom municating telephone-work. It is to be understood, however, that the apparatus hereinafter described may be arranged in any suitable form of ease or may be mounted in a stand suitable for desks or tables, if desired.

The door 2 carries any usual or suitable form of transmitter 3, the said transmitter being secured to the door in any desired manner. The door is further provided with aseries of label-holders 4, one for each of the stations on the line, and with a series of pushbuttons 5, 6, and 7, these push-buttons passing through perforations in the door and being further supported, if desired, by sleeves 8, secured to the inner side of the door.

The interior of the box is provided with a suitable support, which in the present instance is shown as consisting of a block 9, mounted upon two supporting blocks or feet 10. The block 9 is preferably recessed onits upper face, so as to provide two supporting portions 11 and 12, which lie in different planes. To the member 11 is secured in any suitable manner, as by screws 13, a bracket 14, to which is pivoted a movable yoke or receiver-support 15, said support having its yoked or supporting end extending outside of the casing, as is common in such constructions. Theyokedendofthesupport15serves to sustain a telephone-receiver 16 when the same is not in use, and there is provided a coiled spring 17, which is sufficiently strong to throw the receiver-support 15 upward when the receiver is not in its normal position, but which is not strong enough to sustain the weight of the receiver. When, therefore, the receiver is on the support 15, the support will be forced down against the lower edge of a slot in a plate 18, which is secured to the side of the case over the perforation through which the yoked arm extends; but when the receiver is in use the spring will throw the support 15 upward against the upper edge of the slot in said plate.

While the form of movable telephone-receiver support just described is a preferable one, it is to be understood that the invention is by no means confined thereto, as other suitable telephone receiver supporting means may be used in its stead.

Secured to the surface 12 of the block 9 is another block 19, said block having a recess 20 therein, through which passes the shank of the receiver-support. To this block 19 are secured circuit-terminals 21, 22, and 23, which will be hereinafter referred to.

Across the upper edge of the case 1 there extends a shelf 24, said shelf sustaining any suitable calling device-such, for instance, as the usual bell 25.

The block 9 is made somewhat narrower than the case, and between the block and the front side of the case is located one member of a switch device. WVhile the construction of this switch member may be considerably varied, itwill preferably be mounted so as to receive a rocking movement and will preferably be generally cylindrical in outline, although it may vary in form considerably from a true cylinder. The term cylinder as used in the specification and claims, therefore, is not intended to be confined to a memher which is absolutely circular in cross-section. As shown, this switch member consists of a cylinder 26, formed of metal or other suitable conducting material. This cylinder 26 is journaled in an upper bearing 27 and a lower bearing 28, these bearings being preferably formed of light sheet metal and having perforations which receive journals 29 and 30, formed on or secured to the ends of the cylinder. In order to limit the movement of the cylinder in one direction, there is preferably provided a stop 31, which is or may be made in the form of a pin secured to the cylinder, which stop in certain positions of the cylinder strikes the block 19 before referred to.

Secured to the surface 11 of the block 9 are a plurality of circuit closing devices which, while they may be varied in form, preferably consist of spring-plates 35, 36, and 37. Three of these plates are shown; but it is to be understood that there will be as many of them as there are stations upon the line.

Lying beneath the circuit-closing fingers just before referred to is a contact, which maybe variously constructed,but which preferably consists of a plate 38, said plate being securedin any suitable manner, as by screws, to the surface 12 of the block 9 and preferably having its free edge in proximity to the cylinder 26, but not in contact therewith.

The rocking member which, as before stated, is the cylinder 26,.is provided with means which enables the spring plates or fingers to give it its rocking movement and with means by which the fingers are interlocked with it, the latter set of means being independent of the first set of means. In the construction shown the rocking member or cylinder 26 is provided with a slot 32, the sides of which are marked, respectively, 33 and 34, and one of the sides of the slot operates in connection with a finger to give the rocking switch member its movement, and the other side of the slot cooperates with the finger to interlock the parts of the switch. The slot may, however, be replaced by other devices. In the construction shown the spring fingers before described are sufficiently long so that when one or more of them are pressed inward by the push-buttons 5, 6, and 7 before described they will pass into the slot 32 of the cylinder 26. As soon, however, as they pass the edge 33 of the slot they come into contact with the edge 34 and move the cylinder slightly, its movement being of course toward the fingers. This movement of the cylinder, while limited, is sufficient to cause the edge 33 of the slot in the cylinder to take over the end of the fingers, and thus hold the cylinder and finger or fingers interlocked. Fig. 6 illustrates the finger 35 held in its innermost position. An inspection of this figure shows that the push-button 5 has been pushed in so that the finger 35 has been brought into contact withthe plate 38 and has also rocked the cylinder. When, therefore, pressure is removed from the button, the finger 35 will fly up and its outer end will be caught by the edge 33 of the slot, as shown in Fig. 7. WVhen any one of the fingers 35 36 37 is forced against the plate 38, a callingcircuit, to be hereinafter described, is closed, and the call of the station with which it isdesired to communicate is operated. When pressure is removed from the finger, itsprings back against the edge ofthe cylinder 26, and the contact between it and the cylinder closes the talking-circuit of the station with which it is desired to communicate. In the same way if it is desired to communicate with more than one station the simultaneous pressing of the fingers belonging thereto will operate the calls and establish the talking-circuit for all the stations with which it is desired to communicate. The details of the talking and calling circuits will be hereinafter described.

After communication between the stations has been had it is necessary to restore the parts to their original position-that is, to move the cylinder in the reverse direction, so as to release the finger or fingers from engagement therewith. While this may be accomplished in various ways, it will preferably be effected by means operated from the telephone-receiver support. The means by which the receiver-support is caused to move the cylinder may be varied widely. In the construction shown, however, the cylinder 26 carries an arm 39, the upper end of said arm extending upward through a slot 40 in the cylinder. .At its lower end the arm 39 is journaled on a short pin 41, which is mounted in suitable bearings formed on or secured to the cylinder. The arm 39 has its lower end beveled, as shown at 43. Bearing against this end is a spring 44, secured to the cylinder and which normally keeps the arm in the position shown in Fig. 3. When the arm is in the position shown in Fig. 3, it will be seen that pressure exerted on one side of it will rock the cylinder in its bearings; but if the pressure is exerted on the other side of it the arm will yield against thepressure of the spring 44 and will not rotate the cylinder.

Any suitable means may be employed to operate in connection with the arm 39 to rotate the cylinder when desired. Preferably, however, as shown, there will be secured to the receiver-support an angularly -arranged plate 45, which forms a cam. This plate is shown as secured to the support by a nut 46 and as insulated therefrom by washers 47 48. The cam-plate 45 is so arranged that when the receiver-support is in its lower position or the position shown in Fig. 3 and the cylinder has been rocked into the position shown in Fig. 6 the forward edge of the plate will pass between the upper end of the arm 39, and the casing. The .arm will therefore yield against the stress of the spring44 and allow the cam-plate to pass it without rotating the cylinder. When, however, the support is moved downward, the cylinder being in the position shown in Fig. 6, the cam-plate will pass behind the upper end of the arm 39 and will rock the cylinder on its bearings, causing it to assume the. position shown in Fig. 5. When one of the spring-fingers has been pressed in, the cylinder moved, the finger interlocked therewith, and the receiver taken offthe movable book 15, the. hook will be thrown upward by its spring 17 without moving the cylinder. IVhen, however, the receiver is again restored to the hook, its weight will move the hook downward and causethe cam-plate to operate upon the arm 39, thus restoring the cylinder to its original position anddisengaging the finger from it.

The support 9 has secured to its lower end a pair of terminals 49 50, and to these terminals are connected the terminals 51 and 52 of the usual flexible cord, which is secured to the binding-posts of the receiver.

The circuits which are used may bewidely varied. Fig. 7, however, shows a preferred form of the circuits employed, three stations, (A, B, and 0,) with their connections, being illustrated in this figure.

Connected to the movable hook or support.

ing to a battery 61. From the battery 61 a wire 62 is run, said wire connecting with the contact-plate 38 before described. From the terminal 21, which is mounted on the block 19, is led a wire 63, said wire forming the primary circuit-wire of the inductioncoil 64. From the coil 64 is led a wire 65, said wire running to the transmitter 3. From the transmitter 3 circuit is made by means of a wire 66 to the contact-plate 38 before described. From the terminal 22 a wire 67 is led, the said wire leading to the secondary of the induction-coil 68. From the secondary of the coil a wire 69 leads to the receiver 16. From the receiver 16 a wire leads to one end of the cylinder 26. From the other end of the cylinder 26 runs the home'station terminal 71, the said wire being connected to a bindingpost 72. From the binding-post 72 is run a wire 73, which wire forms the section-wire for the station which has just been described,said wire leading to the fingers 35 of the other stations. From the binding-post 72 a branch wire 74 is led, said wire running to the bell 25. From the other side of the bell a wire is led, said wire terminating at the terminal 23. A common return-wire 76 connects with the receiver supports or hooks of the stations. The operation of the apparatus as a whole is asfollows: It being supposed, for instance, that A station desires to call B station, the push button 5 is operated. This button forces the spring-finger 35 which is the calling-terminal for B station, against the plate 38. A circuit is established from the battery 61 to A station through the wire 62, the plate 38 of A station, the wire 73, to the binding-post 72 of B station. From this binding-post 72 the circuit runs by the wire 74 of B station to its bell 25, from the bell by the wire 75 to the terminal 23 of B station, and from this terminal through the support 15 of B station, the common return-wire 76, the support 15 of A station, and the wire 60, back to the battery. The subscriber at A station holds his finger on the button 5 sufficiently long to insure a call and then removes it. The spring-finger 35 being now relieved from pressure of the button moves upward. The downward pressure of the finger 35, however, has rocked the cylinder 26 of A station so that the end of the finger 35 is caught by the edge 33 of the slot 32 in said cylinder, so that the finger is interlocked with the cylinder. As the subscriber moves his finger from the push-button he takes his receiver off the hook 15,and the subscriber at B station,havin g been notified by his call that some one wishes to communicate with him, also removes his receiver from the hook. The hooks at the two stations are now forced up by their springs 17, so that they contact with the terminals 21 2 of each station. A circuit is now established at each station from the battery 61 through the wire 60, the hooks 15, the terminals 21, the wires 63, the primary 64 of the inductioncoils, the Wires 65, the transmitters 3, and the wires 66 to the contacts 38 and from the contacts 38 by the wire 62 to the battery. This current through the primary of the induction-coil sets up an induced current through the secondary, which may be traced as follows: Starting from the secondary 68 of A station, the current goes through the wire 69, receiver 16, and the wire 70 and the cylinder 26. From the cylinder 26 by means of the finger 35 the current goes to the wire 73 and the binding-post 72 of B station. From this binding-post 72 the current goes by means of the home-station terminal 71 of B station to the cylinder 26 of that station. From the cylinder 26 the current goes by the wire 70 of B station to the receiver of that station, then by the wire 69, the secondary 68, and the wire 67 to the terminal 22 of B station. From this terminal the current runs by way of the hook 15 of B station to the common return-wire 76 and from this wire to the hook 15 of A station. From the hook 15 of A station the circuit is made by means of the terminal 22 and the wire 67 and back to the secondary 68. A talking-circuit is thus established between the stations and commu nication can be had between them. When communication has been had between the stations, each subscriber replaces his receiver on its book. The efiect of this at A station, which, it will be remembered, was the callingstation, is to cause the cam-plate 45 to rotate the cylinder 26 and release the spring-finger 35, so that the parts return to their normal position and at the same time break the primary and secondary induction-coil circuits at the terminals 21 and 22. At B station, which was the called station, the cylinder 26 was not disturbed, so that the hanging up of the receiver on the hook at this station simply breaks the primary and secondary inductioncoil circuits. In the same manner and by pressing the proper button any station on the line may call any other station, the circuits employed and the operation of the parts for each calling and receiving station being substantially the same as those which have just been set forth.

By the construction which has been described it will be seen that after a station has called any other station or stations on the line it is impossible, provided the receiver is replaced on its hook, to leave the circuits in any but their normal condition-that is to say, open-since the act of hanging up the receiver necessarily breaks the calling-circuit. If, furthermore, a subscriber who has called one station desires to call another, the inward movement of the contact-finger for the station which he desired to call releases the finger of the station with which he has been talking, and thus interrupts communication with that station. Suppose, for instance, that Astation, having called B station and finished communicating therewith, desires to communicate with another station. He pushes the button for that station and forces in the finger. As this finger moves in, however, past the edge 33 of the slotted cylinder it strikes the said edge and rocks the cylinder upward sufficiently to release the finger 35. The further inward movement of the finger now being'operated, however, rocks the cylinder in the forward direction and puts it in position to be interlocked with said finger. Furthermore, if while two stations are communicating a third station operates the call a strong current is thrown on the line, and the crack ing in the receiver at once informs the stations that their circuit has been broken in upon.

While the switch which has been heretofore described is particularly useful in telephone apparatus, it has a wider application. It is therefore capable of independent use, and it is to be understood that such use is contemplated. Furthermore, the mechanical details by which the invention is carried into effect may be varied within wide limits. The invention is not, therefore, to be limited to the specific construction which has been hereinbefore described.

What is claimed is 1. In a telephone apparatus, the combination with a contact to which the calling-circuit is connected, of an interlocking switch to one member of which the talking-circuit is connected, connections from the other member of the switch toboth the talking and calling circuits, means for operating the lastnamed member so as to close both the calling and talking circuits and to cause the two parts of the switch to interlock so that the talking-circuit is held closed,and means for operating the other member of the switch to disengage the parts, substantially as described.

2. In a telephone apparatus, the combination with-a movable telephone-receiver support, of a contact to which the calling-circuit is connected, an interlocking switch to one member of which the talking-circuit is connected, connections from the other member of the switch to both the talking and calling circuits, means for operating the last-named member so as to close both the calling and talking circuits and to cause the two members of the switch to interlock so that the talking-circuit is held closed, and means operated by the movement of the receiver-support for moving the other member of the switch to disengage the members, substantially as described.

3. In a telephone system, the combination with a plurality of stations having suitable talking and calling devices and suitable circuits therefor, of a contact-plate at each station to which all the calling-circuits are connected, a switch at each station including a single member to which all the talking-circuits are connected and a plurality of cooperating members to each of which the talking and calling circuits of a single station are connected, said members being also arranged to cooperate with said contact-plate, means for operating each of said plurality of switch members to close both the calling and talking circuits for its station, and means for locking said members with their talking-circuits closed, substantially as described.

4:. In a telephone system, the combination with a plurality of stations having suitable talking and calling devices and suitable circuits therefor, of a contact-plate at each sta tion to which all the calling-circuits are connected, a switch at each station including a single member to which all the talking-circuits are connected and a plurality of cooperatingmembers to each of which the talking and calling circuits of a single station are connected, said members being also arranged to cooperate with said contact-plate, means for operating each of said plurality of switch members to close both the calling and talking circuits for its station, means for locking said members with their talking-circuits closed, and means for operating the single member to disengage the parts, substantially as described.

5. In a telephone system, the combination with a plurality of stations having suitable talking and calling devices and suitable circuits therefor, of a movable support at each station, a contact-plate at each station to which all the calling-circuits are connected, a switch at each station including a single member to which all the talking-circuits are connected andaplurality ofcooperatingmembers to each of which the talking and calling circuits of a single station are connected, said members being also arranged to cooperate with said contact-plate, means for operating each of said plurality of switch members to close both the calling and talking circuits for its station, means for locking said members with their talking-circuits closed, and means whereby the movable support operates the single member to disengage the parts, subs'tantially as described.

6. In a telephone system, the combination with a plurality of stations having suitable talking and calling devices and suitable circuits therefor, of a contact-plate at each station to which all the calling-circuits are connected, a switch at each station including a rocking member to which all the talking-circuits are connected and a plurality of cooperating members to each of which the talking and calling circuits of a single station are connected, means for operating each of the plurality of members to cause it to cooperate with the contact-plate to close its calling-circuit and to interlock with the rocking member to close its talking-circuit, and means for rocking the member to disengage the parts, substantially as described.

7. In a telephone system, the combination with a plurality of stations having suitable talking and calling devices and suitable circuits therefor, of a movable support at each station, a contact-plate at each station to which all the calling-circuits are connected,

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a switch at each station including a rocking member to which all the talking-circuits are connected and a plurality of cooperating members, to each of which the talking and calling circuits of a single station are connected, means for operating each of the plurality of members to cause it to cooperate with the contact-plate to close its calling-circuit and to interlock with the rocking member to close its talking-circuit, and means whereby the support rocks the member to disengage the parts, substantially as described.

8. In a telephone system, the combination with a plurality of stations having suitable calling and talking devices and suitable circuits therefor, of a contact-plate at each station to which all the calling-circuits are connected, a switch at each station including a rocking slotted member to which all the talking-circuits are connected and a plurality of spring-fingers, one for each station on the line to which the calling and talking circuits of a single station are connected, said fingers being arranged to overlie the contact-plate and the slot in the rocking member and being of a length to pass into the slot in the rocking member when the same is in its normal position but to be engaged by one side of the slot when the member is rocked, means for pressing any one of the fingers against the contact-plate and at the same time causing it to pass into the slot of the rocking member and rotate the same so as to cause the finger to be interlocked with the member, and means for rocking the member to disengage the fingcr, substantially as described.

9. In a telephone system, the combination with a plurality of stations having suitable calling and talking devices and suitable circuits therefor, of a movable support at each station, a contact-plate at each station to which all the calling-circuits are connected, a switch at each station includinga rocking slotted member to which all the talking-circuits are connected, and a plurality of spring-fingers, one for each station on the line, to which the calling and talking circuits of a single station are connected, said fingers being arranged to overlie the contact-plate and the slot in the rocking member and being of a length to pass into the slot in the rocking member when the same is in its normal position but to be engaged by one side of the slot when the member is rocked, means for pressing any one of the fingers against the contact-plate and at the same time causing it to pass into the slot of the member and rotate the same so as to cause the finger to be interlocked with the member, and means whereby the support rocks the member to disengage the finger, substantially as described.

10. In a switch, the combination with a rocking member, of a cooperating member mounted to move toward and away from the rocking member, the rocking member being provided with means whereby the movement of the cooperating member toward it gives it its rocking movement, and with means independent of the means by which it is moved for causing said members to interlock, substantially as described.

11. In a switch, the combination with a rocking member, of a cooperating member mounted to move toward and away from the rocking member, the rocking member being provided with means whereby the movement of the cooperating member toward it gives it its rocking movement and with means independent of the means by which it is moved for causing said members to interlock, and means for giving the rocking member a movement to permit theinterlocked members to become disengaged, substantially as described.

12. In a switch, the combination with a plurality of fingers, of a rocking member provided with moving means and interlocking means, said moving means being spaced from the interlocking means and the fingers being of a length to pass freely into the space between the means, whereby when one of the fingers is pressed against the moving means the member is rocked and the finger interlocked with the rocking member, and means for moving the rocking member to disengage said finger, substantially as described.

18. In a switch, the combination with a rocking slotted member of generally cylindrical form, of a plurality of spring-fingers overlying the slot in said member, said fingers being of a length to pass freely into the slot and being so arranged that a finger when pressed will contact with one side of the slot to rock the member whereby the finger will press against the other side of the slot and interlock with the member when the pressure is removed, and means for moving the member to disengage the finger, substantially as described.

14. In a telephone apparatus, the combination with a movable support, of a switch including a rocking member provided with moving means and interlocking means, said means being spaced apart, a plurality of fingers arranged to enter the space between said moving means and interlocking means and to contact with the moving means so that they may become interlocked with the interlocking means, and suitable connections whereby the movable support moves the rocking member to disengage the fingers, substantially as described.

15. In a telephone apparatus, the combination with a movable support, of a switch including a slotted rocking member of generally cylindrical form and a plurality of fingers overlying the slot of the member, said fingers being of a length to pass freely into said slot, and being arranged to contact with one side of the slot and rock the member when pressed against the side of the slot, whereby the member and fingers become interlocked, and means whereby the movable support rocks the member to disengage the fingers, substantially as described.

16. In a telephone apparatus, the combination with a movable support, of a switch including a movable member and a plurality of cooperating members, means whereby any one of the plurality of cooperating members may be caused to interlock with the movable member, and devices between the movable member and the support which serve to move the member when the support moves in one direction but permit it to remain stationary when the support moves in the opposite direction, substantially as described.

17. In a telephone apparatus, the combination with a movable support, of a switch including a rocking member of generally cylindrical form and a plurality of cooperating fingers, means whereby any one of the fingers may be caused to interlock with the member, a cam moving with the support, and means whereby the cam is caused to rock the member when the support moves in one direction but inoperative to move the member when the support moves in the opposite direction, substantially as described. I

18. In a telephone apparatus,the combination with a movable support, of a switch including a rocking slotted member of generally cylindrical form and a plurality of cooperating fingers, said fingers being of a length to pass into the slot in the cylinder when the member is in normal position but to be held in the slot when the member is rocked, the arrangement being such that the fingers rock the member after passing into the slot, and means operated by the support for rocking the member to permit the fingers to become disengaged, substantially as described.

19. In a telephone apparatus, the combination with a movable support, of a switch including a rocking slotted member of generally cylindrical form and a plurality of cooperating fingers, said fingers being of a length to pass into the slot in the member when the member is in normal position but to be held in the slot when the member is rotated, the arrangement being such that the fingers rock the member after assing into the slot, a cam carried by the support, and a spring-held pin which is engaged by the cam to rock the member on one movement of the telephonesupport but yields to allow the cam to pass it on the other movement of the support, substantially as described.

20. In a telephone apparatus, the combination with a suitable case, of a movable support, a switch including a rocking member of generally cylindrical form and a series of cooperating fingers, means whereby any one of the fingers may be interlocked with the member, a contact-plate lying beneath the fingers, a series of push-buttons, one for each finger, for forcing the fingers against the contactplate and to cause them to interlock with the member, and means operated by the movable support for rocking the member to disengage the fin gers,substantially as described.

21. In a telephone apparatus, the combination with a suitable case, of a movable support mounted therein, a slotted rocking member of generally cylindrical form also mounted in the case, a contact-plate carried by the case, a series of fingers cooperating with the plate and member, the fingers being of a length to pass within the slot of the member when it is in its normal position but to be engaged by the side of the slot when the member has been rocked, a series of push-buttons mounted in the case operating to force the fingers against the contact-plate and at the same time to cause them to rock the member whereby they become interlocked therewith, and means operated by the support for rocking the member to disengage the fingers, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

EDGAR W. HAZAZER.

Witnesses:

T. F. KEHOE, J. A. GRAVES. 

